On the Mode Based Simulation of Dry Friction inside Lap Joints

Markus Breitfuss, Wolfgang Witteveen, Gerhard Prechtl

Research output: Chapter in Book/Report/Conference proceedingsConference contribution

Abstract

Recently proposed joint interface modes (JIM), which have been presented at the IMAC 25th, consider Newton's third law across a joint already at the stage of mode generation. This approach leads to significant improvements in the subsequent mode based simulation, where nonlinear contact and frictional forces are applied. This contribution is focusing on the efficient computation of forces according to dry friction. The first part covers the friction model itself. A lot of literature points out that the discontinuity of the well known Coulomb friction is a major drawback in terms of efficient time integration. Therefore alternative friction models are investigated and a comparison with the Coulomb model is performed. The second part deals with the relevance of trial functions in tangential direction of the contact surface. The latter mentioned JIM can be subdivided into Ritz vectors, which are required to approximate the joint deformation in joint normal direction where the contact forces are acting, and such, which are required to approximate the joint deformation in joint tangential direction where the friction forces are acting. Theoretical considerations and a numerical example are presented which reveal, that the number of JIM in tangential direction is significantly smaller as the one in contact direction without losing remarkable quality of the result.

Original languageEnglish
Title of host publicationTopics in Experimental Dynamics Substructuring and Wind Turbine Dynamics - Proceedings of the 30th IMAC, A Conference on Structural Dynamics, 2012
Pages289-298
Number of pages10
DOIs
Publication statusPublished - 2012
EventInternational Modal Analysis Conference XXX - Jacksonville, United States
Duration: 30 Jan 20122 Feb 2012

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume2
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

ConferenceInternational Modal Analysis Conference XXX
Country/TerritoryUnited States
CityJacksonville
Period30.01.201202.02.2012

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